CN220063966U - Gas chromatography-mass spectrometer interface device and gas chromatography-mass spectrometer - Google Patents
Gas chromatography-mass spectrometer interface device and gas chromatography-mass spectrometer Download PDFInfo
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- CN220063966U CN220063966U CN202321353970.0U CN202321353970U CN220063966U CN 220063966 U CN220063966 U CN 220063966U CN 202321353970 U CN202321353970 U CN 202321353970U CN 220063966 U CN220063966 U CN 220063966U
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- 239000012528 membrane Substances 0.000 claims abstract description 44
- 239000004205 dimethyl polysiloxane Substances 0.000 claims abstract description 37
- 238000001819 mass spectrum Methods 0.000 claims abstract description 37
- 229920000435 poly(dimethylsiloxane) Polymers 0.000 claims abstract description 37
- 238000004891 communication Methods 0.000 claims abstract description 16
- 235000013870 dimethyl polysiloxane Nutrition 0.000 claims description 33
- 238000004987 plasma desorption mass spectroscopy Methods 0.000 claims description 32
- CXQXSVUQTKDNFP-UHFFFAOYSA-N octamethyltrisiloxane Chemical compound C[Si](C)(C)O[Si](C)(C)O[Si](C)(C)C CXQXSVUQTKDNFP-UHFFFAOYSA-N 0.000 claims description 31
- 238000007789 sealing Methods 0.000 claims description 27
- 210000001503 joint Anatomy 0.000 claims description 18
- 238000010438 heat treatment Methods 0.000 claims description 14
- 238000005070 sampling Methods 0.000 claims description 6
- 238000004817 gas chromatography Methods 0.000 claims description 5
- 230000000149 penetrating effect Effects 0.000 claims description 2
- 238000005485 electric heating Methods 0.000 claims 1
- -1 polydimethylsiloxane Polymers 0.000 abstract description 3
- 239000007789 gas Substances 0.000 description 70
- 238000001514 detection method Methods 0.000 description 15
- 238000004949 mass spectrometry Methods 0.000 description 14
- 239000000126 substance Substances 0.000 description 8
- 239000000243 solution Substances 0.000 description 7
- 238000004458 analytical method Methods 0.000 description 6
- 238000004587 chromatography analysis Methods 0.000 description 6
- 108010083687 Ion Pumps Proteins 0.000 description 5
- 239000012159 carrier gas Substances 0.000 description 5
- 238000004544 sputter deposition Methods 0.000 description 5
- 230000035945 sensitivity Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000002290 gas chromatography-mass spectrometry Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 239000002912 waste gas Substances 0.000 description 2
- 238000006424 Flood reaction Methods 0.000 description 1
- 208000033962 Fontaine progeroid syndrome Diseases 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
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- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
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- 239000007924 injection Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000012216 screening Methods 0.000 description 1
- 238000012031 short term test Methods 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 238000010183 spectrum analysis Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
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Abstract
The utility model relates to an interface device of a gas chromatograph-mass spectrometer, which is arranged between a chromatographic module and a mass spectrum module in the gas chromatograph-mass spectrometer and comprises a diaphragm communication assembly and a pulse electromagnetic valve, wherein the diaphragm communication assembly comprises a multipath interface body, the surface of which is provided with a plurality of air inlets, an air outlet and a diaphragm groove, the air inlets and the air outlets are communicated with the bottom of the diaphragm groove through the inside of the multipath interface body, the outside of the multipath interface body is communicated with corresponding connecting ports of the chromatographic module, a PDMS (polydimethylsiloxane) film is embedded in the diaphragm groove, and a film bracket fixedly connected with the multipath interface body is covered outside the diaphragm groove. An air outlet hole communicated with the inlet end of the pulse electromagnetic valve is formed in the middle of the membrane support, and the outlet end of the pulse electromagnetic valve is communicated with a corresponding connection port of the mass spectrum module. According to the utility model, the gas output by the chromatographic module is filtered through the PDMS film, only the sample gas to be detected passes through, and then the gas path is controlled to be on-off through the pulse electromagnetic valve, so that the gas quantity and the gas inlet speed of the gas entering the mass spectrum module are reduced.
Description
Technical Field
The utility model relates to the technical field of chromatographs and mass spectrometers, in particular to a gas chromatograph-mass spectrometer interface device and a gas chromatograph-mass spectrometer.
Background
The gas chromatography-mass spectrometer (Gas Chromatography-Mass Spectrometer, GCMS for short) is also called a gas chromatograph-mass spectrometer, is an instrument and equipment which combines the characteristics of gas chromatography and mass spectrometry and can identify different substance components in a sample, and is mainly applied to separation and detection of complex compounds in various fields such as industrial detection, food safety, environmental protection and the like. The gas chromatograph generally comprises a chromatographic module and a mass spectrum module, and in the working mode of the chromatographic module and the mass spectrum module, the concentration adsorption device can collect and concentrate sample gas in advance, then the sample gas enters a chromatographic column of the chromatographic module for separation, and each separated component gradually enters the mass spectrum module for mass analysis.
At present, some manufacturers can also produce some portable gas chromatograph-mass spectrometer, and when emergent environmental pollution incidents, detection personnel can often use portable gas chromatograph-mass spectrometer to carry out the short-term test to the contaminated site to the detection personnel learn the testing result as early as possible, thereby in time handle the incident, avoid causing more serious harm because of processing delay. The working mode of the portable gas chromatograph includes not only the combination mode but also a quick check mode (also called a simple substance spectrum analysis mode), and the quick check mode has higher detection speed, so that the portable gas chromatograph can be frequently used in field detection.
In the quick-check mode, the sample gas can directly enter the mass spectrum module for analysis without passing through the gas chromatographic column. Therefore, in the rapid-check mode, the sample gas is largely and rapidly output from the chromatography module and then floods into the vacuum chamber of the mass spectrometry module, as compared to the combined mode. At present, in order to avoid that the high vacuum degree of a vacuum cavity in a mass spectrum module is damaged by the entering of sample gas, a chemical getter pump and a sputtering ion vacuum pump are generally adopted in a portable gas mass spectrometer to maintain the working environment of the high vacuum in the vacuum cavity.
However, it is difficult to quickly restore the vacuum chamber to a desired vacuum pressure when the sample gas is excessively injected despite the provision of the chemical getter pump and the sputter ion pump, thereby affecting the detection accuracy of the mass spectrometry module. The long-term operation in the quick-check mode can greatly reduce the service life of the chemical getter pump and the sputtering ion pump in the mass spectrum module, and the sensitivity of the electron multiplier, and even damage the chemical getter pump and the sputtering ion pump to be scrapped.
Disclosure of Invention
In order to solve the problems, the utility model provides a gas chromatography-mass spectrometer interface device and a gas chromatography-mass spectrometer, wherein the interface device is arranged between a chromatography module and a mass spectrometry module, a PDMS film (Chinese is called as a polydimethylsiloxane film) and a pulse electromagnetic valve are arranged in the interface device, the PDMS film can reduce the amount of gas transferred from the chromatography module to the mass spectrometry module, the pulse electromagnetic valve can reduce the transfer rate of sample gas to the mass spectrometry module, reduce the impact on the vacuum environment in a vacuum cavity, avoid influencing the detection precision of the mass spectrometry module and avoid damaging the mass spectrometry module.
The utility model discloses a gas chromatograph-mass spectrometer interface device, which adopts the following technical scheme: a gas chromatograph-mass spectrometer interface device is arranged between a chromatographic module and a mass spectrometer module and comprises a diaphragm communication assembly and a pulse electromagnetic valve.
The membrane communication assembly comprises a multipath interface body, a PDMS membrane (polydimethylsiloxane film) and a membrane bracket. The surface of the multipath interface body is provided with a plurality of air inlets, an air outlet and a diaphragm groove, each air inlet and the air outlet penetrate through the multipath interface body to be communicated with the bottom of the diaphragm groove, each air inlet and the air outlet are respectively used for being communicated with corresponding connecting ports of the chromatographic module outside the multipath interface body, the PDMS film is embedded in the diaphragm groove, the film support covers the outside of the diaphragm groove and is abutted to one side of the diaphragm groove, the film support is in sealing connection with the multipath interface body, an air outlet is formed in the middle of the film support, and each air inlet is communicated to the air outlet through the PDMS film.
The pulse electromagnetic valve is located on one side, far away from the multipath interface body, of the membrane support, the pulse electromagnetic valve is provided with an inlet end and an outlet end, the inlet end of the pulse electromagnetic valve is communicated to the air outlet hole of the membrane support, and the outlet end of the pulse electromagnetic valve is communicated to the corresponding connection port of the mass spectrum module.
As a further limitation to the above technical solution, the interface device further includes an intermediate joint, and the air outlet hole is connected to the inlet end of the pulse electromagnetic valve via the intermediate joint. The two ends of the middle joint are provided with external threads, a through hole penetrating through the two threaded ends is formed in the middle joint, one threaded end of the middle joint is in threaded connection with the air outlet hole, and the other threaded end of the middle joint is in threaded connection with the inlet end of the pulse electromagnetic valve.
As a further limitation of the above technical solution, the interface device further comprises a plurality of connection joints. The multi-channel interface comprises a multi-channel interface body, a plurality of air inlets and an air outlet, and an outlet end of a pulse electromagnetic valve, wherein the air inlets and the air outlet of the multi-channel interface body are respectively in threaded connection with a connecting joint, the air inlets and the air outlet of the multi-channel interface body are respectively in airtight connection with corresponding connecting ports of a chromatographic module through the connecting joints, and the outlet end of the pulse electromagnetic valve is in airtight connection with corresponding connecting ports of the mass spectrum module through the connecting joints.
As a further limitation to the above technical solution, the interface device further includes a heating element and a temperature sensor, where the heating element and the temperature sensor are both installed in the multipath interface body in a plug-in manner.
As a further limitation to the technical scheme, the heating element is a miniature electrothermal tube, and the temperature sensor is a miniature cylindrical PT100 thermal resistor.
As a further limitation to the above technical solution, the diaphragm communication assembly further includes a sealing ring. The multi-path interface body surface provided with the diaphragm groove is also provided with an annular sealing groove, the sealing groove surrounds the periphery of the diaphragm groove, the sealing groove is aligned with the center of the diaphragm groove, and the sealing ring is embedded in the sealing groove and is abutted to the diaphragm support.
As a further limitation to the above technical solution, the chromatographic module is provided with a combined mode output port, a quick-check mode output port, an internal standard output port and a sampling pump.
The air inlets arranged on the multipath interface body comprise an air inlet I, an air inlet II and an air inlet III. The first air inlet is used for being communicated to the combined mode output port of the chromatographic module, the second air inlet is used for being communicated to the quick-looking-up mode output port, and the third air inlet is used for being communicated to the internal standard output port; the exhaust port of the multipath interface body is used for being communicated with the exhaust port of the sampling pump.
As a further limitation of the above technical solution, the mass spectrometry module includes an ion source and a sample delivery pipe, and the outlet end of the pulse electromagnetic valve is used for being communicated to the sample delivery pipe and communicated into the ion source through the sample delivery pipe.
In addition, in the utility model, the gas chromatography-mass spectrometer adopts the following technical scheme: a gas chromatography mass spectrometer comprising the gas chromatography mass spectrometer interface device.
By adopting the technology, the utility model has the advantages that:
1. the multi-way interface body in the diaphragm communication assembly is communicated with each corresponding connection port of the chromatographic module, so that the gas exhausted by the chromatographic module flows to the mass spectrum module through the multi-way interface body. The PDMS film in the diaphragm communication assembly can play a role in filtering and screening all gases flowing through the multipath interface body, and as the PDMS film is a semi-permeable film with the thickness of 100us, specific components in the sample gas can be separated from other gases such as carrier gas, and the specific components in the sample gas can pass through the PDMS film, and the other gases such as carrier gas can not pass through the PDMS film. Therefore, the PDMS film enables the specific components to be detected in the sample gas to pass through, enter the mass spectrum module for detection analysis, and the other gases are discharged to the outside of the gas chromatograph through the multipath interface body. In this way, the amount of sample gas that can enter the mass spectrometry module is greatly reduced.
2. The on-off of a gas circulation pipeline between the multipath interface body and the gas inlet of the mass spectrum module is controlled by a pulse electromagnetic valve, and the on-off action of the pulse electromagnetic valve is controlled by given electric pulse, so that the sample gas enters the mass spectrum module in a pulse mode after passing through the pulse electromagnetic valve, wherein the pulse width is the valve opening time. The given pulse width is modulated, so that the valve opening time is shortened, and the gas quantity of a sample entering the mass spectrum module in unit time can be reduced, thereby avoiding the problem that the vacuum degree in the vacuum cavity of a large quantity of sample can be destroyed when the sample enters the mass spectrum module, and avoiding the problem caused by the change of the vacuum degree in the cavity: the chemical getter pump and the sputtering ion pump have the problems of short service life, poor sensitivity of the electron multiplier, damaged mass spectrum module and the like.
Drawings
FIG. 1 is a schematic diagram of the overall structure of an interface device according to the present utility model;
FIG. 2 is an exploded view of the assembled structure of the interface device of the present utility model;
FIG. 3 is a schematic diagram of the internal structure of the multiple interface body according to the present utility model;
FIG. 4 is a cross-sectional view of the structure of FIG. 3 taken along the direction A-A;
in the figure: 1-a multi-way interface body; 101-first air inlet; 102-a second air inlet; 103-air inlet III; 104-an exhaust port; 105-diaphragm groove; 106-sealing the groove; 2-PDMS film; 3-a sealing ring; 4-membrane scaffold; 401-an air outlet hole; 5-an intermediate joint; 6-pulse electromagnetic valve; 701-connection joint one; 702-connecting joint II; 703-connecting joint three; 704-connecting joint IV; 705-fifth connection; 8-a heating element; 9-temperature measuring sensor.
Detailed Description
The utility model will be described in further detail with reference to the accompanying drawings and specific examples.
Example 1:
as shown in fig. 1-3, a gas chromatograph-mass spectrometer interface device is installed between a chromatography module and a mass spectrometry module within a gas chromatograph-mass spectrometer. The interface device comprises a diaphragm communication assembly, a pulse electromagnetic valve 6, an intermediate joint 5, a plurality of connecting joints, a heating element 8 and a temperature measuring sensor 9, wherein the plurality of connecting joints comprise a connecting joint I701, a connecting joint II 702, a connecting joint III 703, a connecting joint IV 704 and a connecting joint V705.
The diaphragm communication assembly comprises a multipath interface body 1, a PDMS film 2, a sealing ring 3 and a film support 4.
The surface of the multipath interface body 1 is provided with a plurality of air inlets, an air outlet, a diaphragm groove 105 and an annular sealing groove 106, the sealing groove 106 surrounds the periphery of the diaphragm groove 105, and the sealing groove 106 is aligned with the center of the diaphragm groove 105. Each air inlet and each air outlet penetrate through the inside of the multi-way interface body 1 and are communicated with the bottom of the diaphragm groove 105, and each air inlet and each air outlet are respectively in threaded connection with one connecting joint outside the multi-way interface body 1 and are communicated with corresponding connecting ports of the chromatographic module through the connecting joints.
In this embodiment, the multiple-port body 1 has a structure similar to a rectangular parallelepiped, and for convenience of connection, the diaphragm groove 105 and the seal groove 106 are opened on one side surface of the multiple-port body 1, and the air inlet and the air outlet are opened on the other side surface of the multiple-port body 1.
In this embodiment, the membrane groove 105 formed on the surface of the multi-way interface body 1 is a step groove, the thickness of the PDMS membrane 2 is 100us, and the PDMS membrane 2 is embedded in the step of the membrane groove 105, so that a space is formed between the PDMS membrane 2 and the bottom surface of the membrane groove 105, and a plurality of air inlets and air outlets of the multi-way interface body can be mutually communicated in the space between the bottom surface of the membrane groove 105 and the PDMS membrane 2. The sealing ring 3 is embedded in the sealing groove 106, the membrane bracket 4 covers the outside of the membrane groove 105 and the sealing groove 106, and is abutted with one side of the PDMS membrane 2 exposed out of the membrane groove 105 and one side of the sealing ring 3 exposed out of the sealing groove 106, and the membrane bracket 4 is connected with the multipath interface body 1 through bolt fastening. The middle of the membrane support 4 is provided with an air outlet hole 401, and the air outlet hole 401 and each air inlet are in a semi-communicated state through the PDMS membrane 2, namely, the PDMS membrane 2 can selectively enable certain specific gas components to pass through, and other gases are blocked on one side of the PDMS membrane 2. Since the sealing ring 3 is pressed between the sealing groove 106 and the membrane holder 4 to form a sealing connection between the membrane holder 4 and the multi-channel interface body 1, the sample gas does not overflow from the connection gap between the multi-channel interface body 1 and the membrane holder 4 in the process of passing through the PDMS membrane 2.
The air outlet hole 401 of the membrane support 4 is communicated with the pulse electromagnetic valve 6 through the intermediate joint 5, and the pulse electromagnetic valve 6 is positioned on the side of the membrane support 4 away from the multipath interface body 1. The pulse solenoid valve 6 is equipped with entrance point and exit end, and the both ends of intermediate head 5 all are equipped with the external screw thread, offer the through-hole that runs through two screw thread ends in the intermediate head 5, and one screw thread end and venthole 401 threaded connection of intermediate head 5, the other screw thread end of intermediate head 5, with the entrance point threaded connection of pulse solenoid valve 6. The outlet end of the pulse electromagnetic valve 6 is in threaded connection with a connecting joint and is communicated with a corresponding connecting port of the mass spectrum module through the connecting joint. In this embodiment, the optional model of the pulse solenoid valve 6 is calipprard WHT-2-24.
In this embodiment, the heating element 8 is a micro electrothermal tube, and the temperature sensor 9 is a micro cylindrical PT100 thermal resistor. The heating element 8 and the temperature sensor 9 are inserted and installed inside the multi-path interface body 1, and one end inserted into the multi-path interface body 1 is close to the communication pore canal of each air inlet and each air outlet. The heating element 8 is arranged and used for heating the multipath interface body 1 and the PDMS film 2, so that the PDMS film 2 reaches a proper working temperature, and meanwhile, the multipath interface body 1 and even the whole interface device are at a higher temperature, and the sample gas to be tested is prevented from being attached to the inside of the interface device due to cooling in the transmission process, thereby avoiding affecting the accuracy of a detection result. The temperature measuring sensor 9 is used for detecting the temperature of the interface device in real time, and the temperature measuring sensor 9 is arranged, so that the heating temperature of the heating element 8 can be conveniently controlled, the whole process of conveying the sample gas in the interface device can be in a certain temperature range, and the temperature is usually kept at about 70 ℃.
In this embodiment, the air inlet provided on the multi-way interface body 1 includes an air inlet I, an air inlet II and an air inlet III, the air inlet I of the multi-way interface body 1 is in threaded connection with the first connecting joint, the air inlet II is in threaded connection with the second connecting joint, the air inlet III is in threaded connection with the third connecting joint, the air outlet of the multi-way interface body 1 is in threaded connection with the fourth connecting joint, and the outlet end of the pulse electromagnetic valve 6 is in threaded connection with the fifth connecting joint.
The working principle of the embodiment is as follows: the interface device of the gas chromatograph-mass spectrometer is arranged between a chromatographic module and a mass spectrum module in the gas chromatograph-mass spectrometer, wherein a multipath interface body 1 in a diaphragm communication assembly is communicated with each corresponding connection port of the chromatographic module, and the outlet end of a pulse electromagnetic valve 6 is communicated with the corresponding connection port of the mass spectrum module, so that gas exhausted by the chromatographic module flows to the mass spectrum module through the diaphragm communication assembly and the pulse electromagnetic valve 6.
All gases flowing through the multipath interface body 1 are filtered and screened through the PDMS film 2 in the diaphragm communication assembly, and as the PDMS film 2 is a semipermeable film, specific components in the sample gas can be separated from other gases such as carrier gas, the specific components in the sample gas can pass through the PDMS film 2 and enter the mass spectrum module for detection and analysis, and the carrier gas and other waste gases can be blocked and then discharged to the outside of the gas chromatograph through the multipath interface body 1. Therefore, the PDMS membrane 2 allows only the specific components to be detected in the sample gas to pass through, and thus, the amount of the sample gas entering the mass spectrometry module can be greatly reduced.
The on-off of a gas circulation pipeline between the multipath interface body 1 and the air inlet of the mass spectrum module is controlled by the pulse electromagnetic valve 6, and the on-off action of the pulse electromagnetic valve 6 is controlled by given electric pulse, so that the sample gas enters the mass spectrum module in a pulse mode after passing through the pulse electromagnetic valve 6, wherein the pulse width is the valve opening time. The given pulse width is modulated, so that the valve opening time is shortened, and the gas quantity of a sample entering the mass spectrum module in unit time can be reduced, thereby avoiding the problem that the vacuum degree in the vacuum cavity of a large quantity of sample can be destroyed when the sample enters the mass spectrum module, and avoiding the problem caused by the change of the vacuum degree in the cavity: the chemical getter pump and the sputtering ion pump have the problems of short service life, poor sensitivity of the electron multiplier, damaged mass spectrum module and the like.
Example 2:
a gas chromatograph-mass spectrometer comprising an interface device employing the gas chromatograph-mass spectrometer interface device set forth in example 1 and mounted between a chromatography module and a mass spectrometry module in the gas chromatograph-mass spectrometer.
In this embodiment, the chromatography module is provided with a combined mode output port, a quick-check mode output port, an internal standard output port, and a sampling pump, and the mass spectrometry module includes an ion source and a sample delivery conduit. This is a conventional structure that is commonly found in most portable gas chromatograph-mass spectrometers in the market at present, and will not be described here again. The combined mode output port of the chromatographic module is communicated to the first air inlet of the multipath interface body 1 through a connecting joint, and is used for enabling sample gas which is analyzed and separated by the chromatographic column to enter the mass spectrum module under the gas chromatography-mass spectrometry mode so as to realize analysis and detection of the sample gas; the quick-check mode output port is communicated to the air inlet II through the connecting joint II and is used for enabling the sample gas to be tested to directly enter the mass spectrum module without passing through the concentration tube and the chromatographic column in the quick-check mode, so that the direct sample injection detection of the sample gas is realized; the internal standard output port is communicated to the air inlet III through the connecting joint III and is used for inputting an internal standard into the mass spectrum module for internal standard tuning before the detection of the combined mode and the quick-looking-up mode; the extraction opening of the sampling pump is communicated to the exhaust opening of the multipath interface body 1 through the connecting joint four and is used for discharging the residual waste gas and carrier gas which cannot pass through the PDMS film 2 to the external atmosphere. The outlet end of the pulse electromagnetic valve 6 is communicated to a sample conveying pipeline of the mass spectrum module through a connecting joint five and is communicated into an ion source through the sample conveying pipeline. The sample gas can enter the mass spectrum module for mass analysis and detection through the pulse electromagnetic valve 6.
The working principle of this embodiment is the same as that of embodiment 1, and will not be described again.
The foregoing is only a preferred embodiment of the present utility model, but the scope of the present utility model is not limited thereto, and any person skilled in the art, who is within the scope of the present utility model, should substitute or change the technical solution according to the technical concept of the present utility model, to cover the scope of the present utility model.
Claims (9)
1. The utility model provides a gas chromatography mass spectrometer interface arrangement installs between chromatographic module and mass spectrum module, its characterized in that: comprises a diaphragm communication assembly and a pulse electromagnetic valve (6);
the diaphragm communication assembly comprises a multipath interface body (1), a PDMS film (2) and a film support (4);
a plurality of air inlets, an air outlet and a membrane groove (105) are formed in the surface of the multipath interface body (1), each air inlet and each air outlet penetrate through the inside of the multipath interface body (1) and are communicated with the bottom of the membrane groove (105), each air inlet and each air outlet are respectively used for being communicated with corresponding connection ports of the chromatographic module outside the multipath interface body (1), the PDMS membrane (2) is embedded in the membrane groove (105), the membrane support (4) covers the outside of the membrane groove (105) and is abutted to one side of the PDMS membrane (2) exposed out of the membrane groove (105), the membrane support (4) is in sealing connection with the multipath interface body (1), an air outlet (401) is formed in the middle of the membrane support (4), and each air inlet is communicated to the air outlet (401) through the PDMS membrane (2);
the pulse electromagnetic valve (6) is located at one side, far away from the multipath interface body (1), of the membrane support (4), the pulse electromagnetic valve (6) is provided with an inlet end and an outlet end, the inlet end of the pulse electromagnetic valve (6) is communicated to an air outlet hole (401) of the membrane support (4), and the outlet end of the pulse electromagnetic valve (6) is communicated to a corresponding connection port of the mass spectrum module.
2. A gas chromatograph-mass spectrometer interface device according to claim 1, wherein: the air outlet hole (401) is communicated to the inlet end of the pulse electromagnetic valve (6) through the middle joint (5);
external threads are arranged at two ends of the middle joint (5), a through hole penetrating through two threaded ends is formed in the middle joint (5), one threaded end of the middle joint (5) is in threaded connection with the air outlet hole (401), and the other threaded end of the middle joint (5) is in threaded connection with the inlet end of the pulse electromagnetic valve (6).
3. A gas chromatograph-mass spectrometer interface device according to claim 1, wherein: the device also comprises a plurality of connecting joints;
the device comprises a multi-path interface body (1), a plurality of air inlets and an air outlet, wherein the air inlets and the air outlet of the multi-path interface body (1) are respectively in threaded connection with a connecting joint, the air inlets and the air outlet of the multi-path interface body (1) are respectively in airtight connection with corresponding connecting ports of a chromatographic module through the connecting joints, and the outlet of the pulse electromagnetic valve (6) is in airtight connection with corresponding connecting ports of the mass spectrum module through the connecting joints.
4. A gas chromatograph-mass spectrometer interface device according to claim 1, wherein: the device also comprises a heating element (8) and a temperature measuring sensor (9);
the heating element (8) and the temperature measuring sensor (9) are inserted and installed inside the multipath interface body (1).
5. The gas chromatograph-mass spectrometer interface device of claim 4, wherein: the heating element (8) is a miniature electric heating tube, and the temperature measuring sensor (9) is a miniature cylindrical PT100 thermal resistor.
6. A gas chromatograph-mass spectrometer interface device according to claim 1, wherein: the diaphragm communication assembly further comprises a sealing ring (3);
the surface of the multipath interface body (1) provided with the diaphragm groove (105) is also provided with an annular sealing groove (106), the sealing groove (106) surrounds the periphery of the diaphragm groove (105), and the sealing ring (3) is embedded in the sealing groove (106) and is abutted to the film support (4).
7. A gas chromatograph mass spectrometer interface device according to any of claims 1-6, wherein: the chromatographic module is provided with a combined mode output port, a quick-check mode output port, an internal standard output port and a sampling pump;
the air inlet arranged on the multipath interface body (1) comprises an air inlet I (101), an air inlet II (102) and an air inlet III (103), wherein the air inlet I (101) is used for being communicated with a combined mode output port of the chromatographic module, the air inlet II (102) is used for being communicated with the quick-checking mode output port, and the air inlet III (103) is used for being communicated with the internal standard output port; the exhaust port (104) of the multipath interface body (1) is used for being communicated to the exhaust port of the sampling pump.
8. The gas chromatograph-mass spectrometer interface device of claim 7, wherein: the mass spectrum module comprises an ion source and a sample conveying pipeline, wherein the outlet end of the pulse electromagnetic valve (6) is used for being communicated to the sample conveying pipeline and is communicated into the ion source through the sample conveying pipeline.
9. A gas chromatography mass spectrometer, characterized in that: a gas chromatograph mass spectrometer interface device comprising any of claims 1-8.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202321353970.0U CN220063966U (en) | 2023-05-31 | 2023-05-31 | Gas chromatography-mass spectrometer interface device and gas chromatography-mass spectrometer |
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| CN202321353970.0U CN220063966U (en) | 2023-05-31 | 2023-05-31 | Gas chromatography-mass spectrometer interface device and gas chromatography-mass spectrometer |
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